128一28x3十17用简便方法计算
128一28x3十17用简便方法计算
128一28x3十17
=128-28-28x2+17
=100-(25+3)x2+17
=100-50-6+17
=50-6+17
=50+11
=61
28X345十28x154十128用简便计算方法?
28X345十28x154十128用简便计算方法???
=28x(345+154)+128
=28x499+128
=28x500-28+128
=14000+100
=14100
28X345十28x154十128这个用简便计算方法?
28X345十28x154十128
=28X345十28x154十28+100
=28×(345+154+1)+100
=28×500+100
=14000+100
=14100
93X28一28X3十280简便演算法
93X28一28X3十280
=28×(93-3+10)
=28×100
=2800
用简便方法计算28x25x3
28×25×3
=7×4×25×3
=(7×3)×(4×25)
=21×100
=2100
675-28x13十17用简便方法计算
675-28x13十17
=675-364+17
=311+17
=328
12.8x36-28x3.6简便方法计算
12.8x36-28x3.6
=12.8x36-2.8x36
=(12.8-2.8)x36
=10x36
=360
412+28X34(简便方法计算)
412+28X34(简便方法计算)
=412+28÷4×3
=412+7×3
=412+21
=433
28x36+64x28用简便方法计算
28x36+64x28
=28x(36+64)
=28x100
=2800
用简便方法计算28x33十84x89
用简便方法计算28x33十84x89
28x33十84x89
=28*3*11+84*89
=84*11+84*89
=84*(11+89)
=84*100
=8400