3.4×22+4×5-4×7=4×(22+5-7)=4×20=80
1)4×22=88 2)4×7=28 3) 4×20=80 4)(22+5-7)=22+5=27-7=20 5) 4×20=80 6)4×5=20 7)88+20=108 8)108-28=80
4.24011216007
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3.4×22+4×5-4×7=4×(22+5-7)=4×20=80
1)4×22=88 2)4×7=28 3) 4×20=80 4)(22+5-7)=22+5=27-7=20 5) 4×20=80 6)4×5=20 7)88+20=108 8)108-28=80
4.24011216007