Question

38x7一18x7怎么巧算

Answer 1

38x7一18x7怎么巧算

38x7一18x7
=（38-18）×7
=20×7
=140

28x82 +18x72怎么巧算

28x82 +18x72=（28+18）*72+28*10=3312+280=3592。

38x26十26X13 51x7怎么巧算?

38x26+26x13+51x7=（38+13）x26+51x7=51x26+51x7=51x(26+7)=51x33=1683

178x78一78x78巧算怎么做?

178x78=13884
78x78=6084
13884-6084=7800

巧算:8888x7-1111x44-2222

8888X7-1111X44-2222 =1111X8X7-1111X44-1111X2 =1111X56-1111X44-1111X2 =1111X(56-44-2) =1111X10 =11110

18x7=2余4，1800除以700=()余()

被除数和除数如果扩大或缩小相同的位数则商不变，余数扩大或缩小相同的倍数，所以18x7=2余4，1800除以700=(2)余(400)

0.78x23+7.8x7.7怎么巧算?

0.78x23+7.8x7.7
=0.78x23+[7.8÷10]x[7.7x10]
=0.78x23+0.78x77
=0.78x[23+77]
=0.78x100
=78

巧算888x7+111x44+777x29

=111×8×7+111×44+111×7×29
=111×56+111×44+111×203
=111×（56+44+203）
=111×303
=33633

3.58x7.4 35.8x0.36-3.58怎么巧算

3.58x7.4+35.8x0.36-3.58
=3.58x7.4+3.58x3.6-3.58
=3.58×(7.4+3.6-1)
=3.58×10
=35.8

38x83+38x18一38能巧算吗

38x83+38x18一38
=38x(83+18-1)
=38x(83+17)
=38x100
=3800