简便运算,算出得数,3.78x2.5 9.8+99.8+0.2x3 2.3x85+23x1.5 34.17x990+341.7 95.6x18+4x1.8 5.13除以12.5 0.385x267+0.733x385 14.8x3.7+14.8x62+0.148x100 (19分之1+7分之2)x19x17以上简算题能够全部算出,并步骤齐全,得数对!只
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简便运算,算出得数,3.78x2.5 9.8+99.8+0.2x3 2.3x85+23x1.5 34.17x990+341.7 95.6x18+4x1.8 5.13除以12.5 0.385x267+0.733x385 14.8x3.7+14.8x62+0.148x100 (19分之1+7分之2)x19x17以上简算题能够全部算出,并步骤齐全,得数对!只
简便运算,算出得数,
3.78x2.5 9.8+99.8+0.2x3 2.3x85+23x1.5 34.17x990+341.7
95.6x18+4x1.8 5.13除以12.5 0.385x267+0.733x385 14.8x3.7+14.8x62+0.148x100 (19分之1+7分之2)x19x17
以上简算题能够全部算出,并步骤齐全,得数对!只要肯写出全部就给分!
简便运算,算出得数,3.78x2.5 9.8+99.8+0.2x3 2.3x85+23x1.5 34.17x990+341.7 95.6x18+4x1.8 5.13除以12.5 0.385x267+0.733x385 14.8x3.7+14.8x62+0.148x100 (19分之1+7分之2)x19x17以上简算题能够全部算出,并步骤齐全,得数对!只
1、3.78x2.5 =3.78×10÷4=37.8÷4=9.45
2、9.8+99.8+0.2x3 =9.8+0.2+99.8+0.2+0.2=10+100+0.2=110.2
3、2.3x85+23x1.5 =23×8.5+23×1.5=23(8.5+1.5)=230
4、34.17x990+341.7=34.17×(990+10)= 34170
5、95.6x18+4x1.8 =956×1.8+4×1.8=(956+4)×1.8=1000×1.8-40×1.8=1800-72=1728
6、 5.13除以12.5 =5.13÷100/8=513×8/100=0.4104
7、0.385x267+0.733x385 =385×0.267+385×0.733=385 ×(0.267+0.733)=385
8、14.8x3.7+14.8x62+0.148x100 =14.8×(3.7+62+1)14.8×66.7=987.16(本题我怀疑你把37写成3.7了,如果是题目里的3.7是37的话,答案=1480
9、(19分之1+7分之2)x19x17=1/19x19x17+2/7x19x17=17+646/7=765/7
9.45 110.2 230 34170
1728 0.4104 385 987.16 765/7 乘法分配律
3.78x2.5 =(4-0.22)x2.5 =4x2.5-0.11x2x2.5=10-0.55=9.45
9.8+99.8+0.2x3= 9.8+0.2+99.8+0.2+0.2=110.2
2.3x85+23x1.5=2.3 x (85+15) = 230
34.17x990+341.7=34.17x(990+10)=34170
95.6x18+4x1.8=1...
全部展开
3.78x2.5 =(4-0.22)x2.5 =4x2.5-0.11x2x2.5=10-0.55=9.45
9.8+99.8+0.2x3= 9.8+0.2+99.8+0.2+0.2=110.2
2.3x85+23x1.5=2.3 x (85+15) = 230
34.17x990+341.7=34.17x(990+10)=34170
95.6x18+4x1.8=1.8x(956+4)=1.8x(1000-40)=1800-72=1728
5.13除以12.5=5.13除以(100x0.125)=5.13除以100除以0.125=0.0513除以0.125=0.0513x8= 0.4104
0.385x267+0.733x385=0.385x(267+733)=385
14.8x3.7+14.8x62+0.148x100=14.8x(65+0.7)+148=14.8x65+14.8x0.7+148=14.8x(60+5)+14.8x0.7+148=14.8x60+14.8x5+14.8x0.7+148=888+70+10.36+148=1120.36(如果没抄错就应该是这样的)
(19分之1+7分之2)x19x17=[(7+19x2)/(19x7)]x19x17=765/7
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