42×(35÷7+4)简便计算
42×(35÷7+4)简便计算
42×(35÷7+4)
=42x(5+4)
=42x(10-1)
=42x10-42x1
=420-42
=378
答题不易,望采纳!
35×(7×4)简便计算
解:采用乘法交换律,
原式=35×(7×4)
=35x4X7
=140x7
=980
42×7÷42×7的简便计算
【】利用结合律
42×7÷42×7
=42÷42×7×7
=7x7
=49
43*65+42*35简便计算
42*65+65+42*35
42*(65+35)+65
4200+65
4265
42×35+57×37+35简便计算
解法1
42×35+57×37+35
=42×35+35+57×37
=(42+1)×35+57×(35+2)
=43×35+57×35+57×2
=(43+57)×35+114
=100×35+114
=3500+114
=3614
解法2
42×35+57×37+35
=42×35+57×(35+2)+35
=42×35+57×35+57×2+35
=42×35+57×35+35+57×2
=(42+57+1)×35+57×2
=100×35+114
=3500+114
=3614
简便计算42*35 61*35-2*70
简便计算
42×35+61×35-2×70
=42×35+61×35-4×35
=(42+61-4)×35
=99×35
=3465
35×42+65×57+15×35=?(简便计算)
35*42+15*35+65*57
=35*(42+15)+65*57
=35*57+65*57
=(35+65)*57
=100*57
=5700
265+158+42+35用简便计算
利用加法交换律,加法结合率
265+158+42+35
原式
=(265+35)+(158+42)
=300+200
=500
望采纳
42乘[169—(78十35)]简便计算
42*[169-(78+35)]
=42*56
=(40+2)*56
=2240+112
=2352
3/10×7+4×3/10-3/10简便计算
3/10×7+4×3/10-3/10
=3/10×(7+4-1)
=3/10×10
=3